Method of producing aluminum nitrids.



i boiling with Water and the remainder, if the boiling takes place at a temperatuire above 100 centigrade i. c.

: under pressure.

.oT'ToKAnsnR EK, OF MADUEEIN, SWITZERLAND.

m'r ion; lo'F'L Pnonncme'ALoMmUi/I m'rnins S eeification of Letters Patent.

Patented Oct. '8, 1907.

inm1 June19, 1906.- Serialllo. 322.443, (syn-nets) To 'ollwhomitqiiuy Be-it'known that I, QrrroxnR-Snnfmc, a subj ectfof il'ie En ine ror of Austria, residing at Madulein; Switzerland ,.=liave"invented a newend useful Method of Produping Aluminum Nitride of which the following is a specificationl My invention relates to themanufacture oi aluminum nitride which present the i'feature that their' nitrogen can be split 'oftas ammonia. One part of'the nitrogen is-already givenoii at the air, a furthei part by "From thisbehavior l conclude that v the productobtained is not a homogeneous one. It is thus as yetimpossible to give its correct chemical formula and it is onlysafe to say that the latter must be Al N whereby it is'indicatcd that the relation for, Al and N may vary. i V

5 My new methodmav be carried out inseveral modes which, however, have the common point that the alu- .minurn nitrids are obtained 'from aluminumlcarbid,

which is employed as-an initial material. In one in stance I powder aluminum carbid, heat it in a suitable "heatingnpnaratusto a 'good redheat and conduct'a current of nitrogen or of'a gas containing nitrogen, as for eiiarnplcair, over Thus, under an increase of volume, aluminum nitrid is iormed. The nitrogen will be absorbed n'orefreadily and easily and in a greater quantity, if adiluent substance, such as carbon or alumina or aluminr 'n 'chlorid or a mixture of any two of them or of-jall three materials is added to the aluminur'n carbid'.

In all of the-modes set forth oi my new method an acid gas, as hydrochloric acid or sulfur dioxid is ad 'vantageously' added to the nitrogen, whereby the formation of aluminuni'nitrids is facilitated.

- A suitable mixture of aluminum carbid, alumina and carbon is one which contains 20% of'aluxniczum carbid. As an additionto the nitrogen quite small quantities of hydrochloiic acid or sulfurous acid are of the acid gas. Aluminum chlorid is sufiiciently present in an admixture of 1%. These quantities,

howeveryare given by way of example and not as exactly limiting the proportions.

1 The method of producing aluminum nitrids, which consists in heating aluminum cal-bid in an atmosphere con taining nitrogen to red heat.

2. The method of producing'aluminum nitrids, which consists in heating a mixture of aluminum car-bid and a diluent substance in an atmosphere; containing nitrogen to red heat. 9

3 The method of producing aluminum nitrids which consists in heating aluminum car-bid in an 'atmosphere containing nitrogen and an acid gas to red heat.

.O'LTOKAR snRPEK'.

Witnesses:

.I. T. Simunsm, AUGUST GJAST.

40 sufficient; for instance the nitrogenmay have 0.1% i 

